Window-spring for burglar-alarms



(Ne Medel.)

J. STEINER.

WINDOW SPRING FOR BURGLAR ALARMS.

Ne. 522,277. Petented July 3, 1894.

WITNESS INVENTR Tosef Sl'iner UNITED vSTATES PATENT .,OFFIQE. l

JOSEF STEINER, OF BROOKLYN, NEW YORK, ASSIGNOR TO THE VESTERN ELECTRIC COMPANY, OF CHICAGO, ILLINOIS.

WINDOWFSPRING FOR BU RGLAR-ALRMS.

SPECIFICATION ferming pere ef' Letters PeeentNe. 522,277, dated July e, 1894.

Application filed November 4, 1893- Serial No. 490,031. (No model.)

To all whom it may concern:

Be it known that I, JOSEF STEINER, a citizen of the United States, residing at Brooklyn,1n` the county of Kings and State of New York, have invented a certain new and useful Improvement in Window-Springs for Burglar-Alarms, (Case No. 6,) of which the following is a full, clear, concise, and exact descriptlon, reference being had to the accompany- Ilung drawings, formiu g a part of this specificaion.

My invention relates to circuit closing switches for burglar alarm systems, particularly for switches in use in windows, generally known as window springs.

Its object is to produce, as an article ot' manufacture, a window spring having its parts so arranged that it may be readily converted from a closed circuit to an open circuit Instrument; that is, that it may be arranged either to close the circuit when' pressed upon by the window sash, or to open the circuit when so pressed.

To this end it consists in a novel combination of parts which I will describe in full with reference to the accompanying drawings illustrating my invention.

Figure 1 of the drawings represents a frontI from beneath. Fig. 4 is a longitudinal section of the window spring, the parts being arranged to open the circuit when the device is operated. Fig. 5 is a similar sectional view showing the parts arranged in position to close the circuit when the windowspring is operated. Fig. 6 is a perspective view of the window spring with certain of the parts removed to show their general construction. i

Referring to the figures, a is a base plate which may be punched from sheet metal. Upon it is mounted, by means of a flatheaded screw b, auwire spring or lever c whose extremities project forward and carry a roller d pivoted upon them projecting through an aperture in the plate o.. vThis roller is adapted to press upon the edge of the sash in the usual way and to be pressed inward thereby. The wire springe is retained in place by setting the screw b down upon a loop formed in the wire. At one extremity of the plate a a post e is mounted, insulated from theplate by rubber washers f g. The post e as a whole is formed bya hollow screw Ih whose broadened head fits into a countersunk opening in the rubber washer g and upon which are screwed the two nuts and lc. A flat springl is slipped over the post beneath` the nut k so that the latter holds the spring Z securely in position when the nut k is screwed down. The opening through the screw h permits the passage of a wood screw to fasten the window spring in place'in the window frame in the usual manner, a corresponding countersunk screw hole a being provided near the other end of the plate a.. The free extremity of the fiat spring Z carries a rubber block m composed of a short cylinder or distance piecefn and a tlat disk o,

4 the circuit is normally closed, the pressure of the spring forcing the point of the screw p against the plate a. The disk 0 then overlaps the wire spring or lever c, the tip of the screw p extending between the parallel sides of the wire lever c. If, now, the roller d be pressed inward, as by the movement of the window sash upon it, the wire spring c is likewise bent inward, and bearin against the disk o lifts it and the springv upward, separating the contact point of screw p from the plate, and thus breaking the metallic 4connection between the parts and opening the circuit. If, however, the spring Z be re versed in position, the distance piece n being placed below or toward ,the frame a as shown in Fig. 5, the spring Z is maintained in a horizontal position, being prevented from contact with any ofthe metallic parts by the abutment of the rubber block m, against the frame. In this position, the circuit is obvi- IDO ously maintained normally open, there being no metallic connection between the spring Z and the frame a. Vhen non1 the roller (Z is pressed inward as before, the wire spring c is pressed against the curved tip-of the spring Z, making metallic connection with it, and thus completing .the circuit.

Obviously my invention is applicable in connection with other devices, as door springs, colnmonly employed in burglar alarm systems, but I do not consider it necessary to describe it in connection therewith; but

I claim as new and desire to secure by Letters Patent- 1. The combination in a window spring, of the lever c adapted to be actuated by the movement of the sash, and the circuit spring Z provided with an insulating disk o upon one side of it and a contact point upon the other side ot' it, the circuit spring being adapted to be reversed in position to bring the disk o between it and the lever, or to bring-the contact point into position to contact with the lever when the latter is moved, substantially as described.

2. The combination witlrthe base plate a, of a lever c mounted thereon adapted to be actuated by the movement of the sash, the circuit spring Z arranged parallel with the base plate and provided with an insulating disk 0 adapted tobear upon the lever c, anda contact point p making connection with the frame a and being also provided with a con-` tact point upon the other side of the spring adapted to make connection with the lever c when the spring is reversed in position, substantially as described.

3. The combination in a window spring, with 'the movab'ledever thereof, of a circuit spring andV means for holding the same in a fixed position with relation to the lever, said spring being provided with an insulating disk upon one side of it, the spring being adapted to be placed in position either with the insulating disk interposed between it and the switch lever so as to be moved by the switch lever, or with its metallic surface in juxtaposition to the switch lever to contact therewith, substantially as described.

4:. As an article of manufacture a Window spring provided with a lever c and a circuit spring Z carrying upon one side of it an insulating disk o and a contact point p adapted to make connection with the basca and` upon its other side a distance piece or post n to hold it at a fixed distance from the lever c, as described.

5. As an article of manufacture a window spring having a lever c adapted to be moved by the sash, and a circuit spring] adapted to contact with the lever, the spring Z being provided with an insulating disk o upon one side of it, and a contact pinp, the springZ being adapted to be reversed in position to bring` the disk o between it and the lever c and to bring the point p into contact with" thebase a, substantially as described.

In witness whereof l hereunto subscribe my naine this 16th day of October, A. D. 1893.

JOSEF STEINER.

lVitnesses:

WM. B. WALLACE, E. R. GtLMoRn. 

